When the racist poll tax was passed in the South, imposing property and other requirements designed to shut out Black voters, many poor whites also lost the right to vote. After Mississippi passed its poll tax law, the number of qualified white voters fell from 130,000 to 68,000

So, what's most relevant? Disenfranchising black folks or disenfranchising poor folks? The rich are happiest when the poor can't vote because poor folks of all hues have this annoying notion that wealth should be shared.

...income levels seem to matter much more for voting in the South. Contrary to what you may have read, the old-fashioned notion that rich people vote Republican, while poorer people vote Democratic, is as true as ever – in fact, more true than it was a generation ago.